Add caching of the installed cross binary

set-build-command.sh

@@ -1,8 +1,9 @@
 set -e
 set -x
 
-if [ -f "$RUNNER_TEMP/cross" ]; then
-    echo "build-command=$RUNNER_TEMP/cross" >> $GITHUB_OUTPUT
+CROSS_DIR="$1"
+if [ -f "$CROSS_DIR/cross" ]; then
+    echo "build-command=$CROSS_DIR/cross" >> $GITHUB_OUTPUT
 else
     echo "build-command=cargo" >> $GITHUB_OUTPUT
 fi